Numbers 4:37-39

Amplified Bible

³⁷ These were numbered of the families of the Kohathites, all who did service in the Tent of Meeting (tabernacle), whom Moses and Aaron numbered according to the commandment of the Lord ^[a]through Moses.

³⁸ The men who were numbered of the sons of Gershon, by their families (clans), and by their fathers’ households, ³⁹ from thirty years and upward even to fifty years old, everyone who entered the service to do the work in the Tent of Meeting (tabernacle);